Mr. Oliver became famous 20 years ago
Celebrity chef Jamie Oliver said he was "sad" after his restaurant group went into administration and up to 1
,300 jobs were at risk.
The group to which the Italian chain of Jamie, Barbecoa and Fifteen belongs, has appointed KPMG as administrators.
A total of 25 restaurants are affected by the move, 23 of which come from the Italian chain of Jamie.
Mr. Oliver said, "I know how difficult this is for all concerned."
Passion & # 39;
"I would also like to thank all the customers who have enjoyed and supported us over the past decade and it has been a real pleasure serving them."
The intention to positively disrupt mid-market dining on British High Street, with great value for money and higher quality ingredients, world-class animal welfare standards, and a great team that shared my passion for great food and service ,
Jamie Oliver Holdings, which operates Jamie Oliver Limited and Jamie Oliver Licensing Limited, and international restaurant franchise Jamie's Italian International Limited continue to trade as usual.
Jamie Oliver's Fifteen Cornwall at Watergate Bay, which operates under a franchise, is also unaffected.
Oliver is known for his Naked Chef books and television programs that have aired in dozens of countries after being shown in the UK for the first time 20 years ago.  He is also committed to a healthier diet, including at school.
His chain is the latest victim of a difficult trading environment on the British high street.
For the past two years, Oliver has been struggling as some of Jamie's Italian and Barbecoa restaurants have closed down.
In 2017, he completed the last of his Union Jacks restaurants and also closed his journal Jamie, which has been running for almost 10 years.
In December of this year, the head chef also put 3 million pounds of his own money into his restaurant business.
Simon Mydlowski, Partner at Gordon's Law Firm and a hotel industry expert, said Jamie has not kept pace with the changing trends.
"To succeed in this sector, you need to constantly evolve – from menus and beverage choices as you engage with customers."
"Restaurants are in for a hiccup, with rising rents, rising food prices, and increasing competition Difference – it's no coincidence that smaller brands have the freedom and flexibility to keep things up-to-date, things are going well now. "
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